Machine for grinding articles with plane surfaces



M. A. EATON. MACHINE FOR GRINDING'ARTICLES WITH PLAN E SURFACES.

APPL ICATIO N FILED MAR. 1-3, I920.

Patented May 3, 1921.

2 SHEETS-SHEET I.

v A. EATON. MACHINE FOR GRINDING ARTICLES WITH PLANE SURFACES.

APPLICATION FILED MAR. 13. I920- V 1,377,1 17, Patented May-3, 1921.

. 2 SHEETSSI'IEEI 2.

Zlwwantoz MALVERN A. EATON, or nrrrnn'zon, new HAMPSHIRE, fass eiron TO rrKE MAN-c recrunme COMPANY, or PIKE,.NE1V HAMPSHIRE, A conronarron or NEW HAMPSHIRE.

MACHINE FOR GRINDING ARTICLES WITH ELANE SURFACES.

I Specification of Letters Patent.

Application filed March 13, 1920. Serial No. 365,299. y

To all whom it mag concern;

Be it known that I, MALVERNA. EATON, a citizen of the United States, residing at Littleton, in the county of Grafton, State of New Hampshire, have invented certain new and useful Improvements in Machines for Grinding Articles with Plane Surfaces, of which the following is 'a description, 'refer-' ence being had to. the accompanying drawings, forming a part hereof.

My invention relates to grinding machines for truing and finishing the surfaces of sharpening stones, such as whetstones or oil stones, or other articles of manufacture, and has for its object to provide a machine for such purpose which will be simple in construction, comparatively inexpensive in construction and operation, will be capable of operating on a large number of stones or other articles at the same time, into which the stones or other articles may be fed and which. will convey them into contact with the grinding means and deliver them" with their surfaces ground without the necesslty for any handling of the stones or other articles other than feeding them to the machine and removing the finished articles. further object of the invention is to provide means for moving a series of sharpening stones or other articles across the face of a moving grinding surface and to hold them against such grinding surface with a regulated pressure and at the same time be capable of yielding sufiiciently to accommodate articles of somewhat varying thickness.

l Vith the above described objects and other objects hereinafter described in view my invention consists in the construction and combination of elements hereinafter described and claimed.

Referring to the drawings,

Figure 1 is a side elevation of a machine for grinding the surfaces of sharpeningstones, such as whetstones, oil stones and the like, embodying my invention,

Fig. 2 is a top plan view of the machine 2 shown in Fig. 1, r

Fig. 3 is a longitudinal vertical sectional view of a portion of the machine shown in Figs. 1 and 2, on line 33 of Fig. 2, on an enlarged scale, and v Flgs. 4 and 5 are vertical cross sectional views on lines H and 5'5 of'Fig. 1, on the same scale asthat of Fig. 3;

In the drawings 1 indicates a grinding disk arranged to rotate on a vertical axis and preferably consisting of a disk of cast iron supplied with sand or other finely divided abrasive material and water in any convenient manner. Supported above the upper Patented-May 3, 1921. 7

surface of the grinding disk by any convenient means as by uprights 2, is a frame comprising parallel horizontalside strips 3', 3,. a short distance above the upper surface j of the grinding disk and extending across it as shown in Fig. 2, and upper side strips 4, 4,

each in the vertical plane of one of the side strips 3, 3, but inclined downward from the rear of the frametoward the front, and sup: ported from the side strips 3, 3, by vertical uprights5, 5, 6, 6, 7, 7, 8, 8, 9, 9, and inclined uprights 10, 10, so as to make a firm structure. In the uprights 5, '5, is ournaled a band wheel or roller 11, and at the front end of the machine is journaled a band wheel; or roller .12, the band wheel or roller .11 belng of considerably greater diameter than the band wheel or roller 12 sothat the 1 upper portion of the belt or band 1 1 carried by these band wheels or rollers travels in a downwardly inclined plane fron the rear of the machine toward the front. The band wheel or roller 12 is here shown as journaled in longitudinalstrips 13, 13, carried by and extending rearward from the uprights 8, 8, and 9, 9. e I

The belt or band 14 which is, carried by the band wheels or rollers 11 and 12 is a broad belt or band of strong material adapted'to carry the stones to be ground. The upper portion of this belt or band between the band wheels or rollers 11 and 12 is supported by a series of idle rollers 15,

journaled in brackets 16, secured to and depending from the upper side strips 4, 4, and its lower portion between the-band wheels or rollers 12 and 11 is arranged to be pressed downward to hold the stones 17 against the face of the grinding disk, by a series of rollers 18, preferably of iron or steel, which are journaled in vertical slots 19 in inner side strips 20 carried by and parallel with the lower side strips 3, 3. From the lower edges of these inner side strips 20 flanges 22 eX- tend inward beneath the edges of the belt or band 14 serving to support the belt or In order to regulate the pressure on the stones and to prevent excessive pressure rods or bars 23 extend beneath the journals of the rollers 18 connected by vertical rods 24 to longitudinal bars 25 which are supported by cords or chains 26 and 27 near their ends. The cords or chains 26 extend. over idle pulleys 28 journaled in upward extensions of vertical uprights 6 above the upper side strips 4, to wheels 29 journaled in upward extensions of uprights 8, and the cords or chains 27 are connected directly to these wheels 29. A lever 30 carrying adjustable weights 31 extends rearward from the shaft 32 the downward movement of the free end of this lever acting through the wheels 29, cords or chains 26 and 27, horizontal bars 25, rods 24 and bars or rods 23, to raise the rollers 18 and relieve the belt or band 14 from their weight.

The band wheel or roller 12 is fixed on. its shaft 33 and this shaft carries on one end a sprocket 34 which is a sprocket chain 35 which in turn is driven by a sprocket 36 on a shaft 37 journaled in uprights 7 above the upper side strips 4, and provided between these side strips with wheels 38 which bear against the upper edges of the belt or band 14 and serve to hold it against a driving roller 39 on the power shaft 40-which is geared to the shaft 37 and carries on one end a sprocket 41 driven by sprocket chain 42 from any convenient source of power.

The mechanism thus far described will be effective to move the stones across the face of the grinding disk and to hold them in contact therewith by the weight of the rollers 18 on the belt or band 14, the rollers being free to individually yield upward and being together held up to a greater or less extent as may be desired by the lever 30.

For convenience inintroducing the stones between the belt or band 14 and the grind ing surface a shelf 43 is provided at the front end of the machine beneath the portion of the belt or band between the band wheel 12 and the edge of the grinding disk and a conveyer belt 44 carried by rollers 45 and 46 is arranged in front of shelf 43 to receive the stones and carry them onto the shelf. A belt tightener roller 47 carried by arms {48 with weight 49 serves to keep the belt 44 tight. In order to take care 'of the stones as they are carried off the grinding disk a shelf 50 is arranged at the rear end of the machine extending rearward from the edge of the disk and inclined upward at its rear end to guide the stones into contact with a belt 51 which is carried by rollers 52, 53, 54, 55, and 56, of which 52 is journaled in downward extensions of the uprights 5, 53 and 54 are journaled in inclined uprights 10, and 55-and 56 are ournaled in levers 57 which are pivoted at their forward ends to the uprightsG, their rear ends being held up to overcome to a greater or less extent the. weight of roller '56, by weight 58 at the end of cord 59 passing over pulley 60. This belt 51 serves to hold the stones against the belt or band 14 as it is carried about the band wheel or roller 11 so that they will be brought onto the upper surface of the up per portion of this belt or band, and this portion of the belt or band being inclined downward toward. the front of the machine, the stones will be carried to the front being prevented from slipping off the belt or band by guide strips 21 carried on the inside of tie upper side strips 4. As the stones reach the band wheel or roller 12 they are pushed off onto shelf 61 which is suitably supported at the front end of the machine where they may be inspected and either returned for further grin ding by being placed on the belt 44 and pushed onto the shelf 43, or may be 7 I removed as finished.

l Vhile the machine as above described is particularly intended for grinding sharpening stones as they come from the stone sawing machines by which they are cut to a more or less rough shape rectangular in cross section and is adapted to operate on their faces and sides to shape them to proper form, it should be understoodthat it is not limited to use for grinding sharpenstones but may be used for shaping or truing otherarticles' intended to have one or more plane faces.

It sbenld also be understood that I do not desire to be limited to the particular constructionand arrangement of parts shown and described as it is obvious that' many changes in details of construction may be made "without departing from the spiritor the invention.

Having thus described my invention what I claim is 1. In a machine for shaping articles by grinding, the combination with a grinding disk rotating in a horizontal plane, of a belt having a portion thereof extending across the face of said grinding disk above and parallel therewith adapted to receive between it and the face of said grinding disk the articles to be ground, and a serles of independent weights arranged to press downward the portion of the belt extending across the face of the grinding disk to hold the articles to be ground against the said face, and means for moving the belt.

2. In a machine for shaping articles by grinding, the combination with a grinding disk rotating in a horizontal plane, of a belt having a portion thereof extendingacross the face of said grinding disk above and parallel therewith adapted to receive between it and the face of said grinding disk the articles to be ground, and a series of independent rollers arranged to press downward the portion of the belt extending across the face of the grinding disk to hold the articles to be ground against the said face, means for moving said belt, and means for counterbalancing the weight of said rollers.

3. In a machine for shaping articles by grinding, the combination with a grinding disk rotating in a horizontal plane, of a belt having a portion thereof extending across the face of said grinding disk above and parallel therewith adapted to receive between it and the face of said grinding disk the articles to be ground, a series of independent rollers arranged to press downward the portion 'of the belt extending across the face of the grinding disk, frames at opposite ends of the rollers provided with vertical slots to receive the journals of the rollers and having flanges extending beneath the edges of the belt, means for moving the belt, and means for counterbalancing the weight of the rollers.

4. In a machine for shaping articles by grinding, the combination with a grinding disk rotating in a horizontal plane, of a belt having a portion thereof extending across the face of said grinding disk above and parallel therewith adapted to receive between it and the face of said grinding disk the articles to be ground, a series of independent rollers arranged to press downward the portion of the belt extending across the face of the grinding disk, frames at opposite ends of the rollers provided with vertical slots to receive the journals of the rollers, means for moving the belt, and

means for counterbalancing the weight of the rollers comprising bars extending be-- neath the journals of the rollers and means for lifting said bars. p

5. In a machine for shaping articles by grinding, the combination with a grinding disk rotating in a horizontal plane, of an endless belt, band wheels on which said belt is carried rotating on horizontal axes and so arranged that the lower portion of the belt extends across the face of the grinding disk above and parallel with said face adapted to receive between it and the said face of the grinding disk the articles to be ground, means for pressing downward the said lower portion of the belt to hold the articles to be ground against the face of the grinding disk, and means for rotating one of said band wheels.

6. In a machine for shaping articles by grinding, the combination with a grinding disk rotating in a horizontal plane, of an endless belt, band wheels on which said belt is carried rotating on horizontal axes and so arranged that the lower portion of the belt extends across the face of the grinding disk above and parallel with said face adapted to receive between it and the said face of the grinding disk the articles to be ground the band wheel at the rear of the machine being of larger diameter than the one at the front so that the upper portion of the belt is inclined downward toward the front, means for pressing downward the lower portion of the belt to hold the articles to be ground against the face of the grinding disk, and means for rotatin one of the band wheels.

In a machine for shaping articles by grinding, the combination with a grinding disk rotating in a horizontal plane, of an endless belt, band wheels on which said belt is carried rotating on horizontal axes and so arranged that the lower portion" of the belt extends across the face of the grinding disk above and parallel with said face adapted to receive between it and the face of the, grinding ground, the band wheel at the rear of the machine being of larger diameter than the one at the front so that the upper portion of the belt is inclined downward toward the front means for holding the articles to be ground in contact with the belt as it passes about the rear band wheel, means for pressing downward the lower portion of the belt to hold the articles to be ground against the face of the grinding disk and means for rotating one of the band wheels.

8. In a machine for shaping articles by grinding, the combination with a grinding disk rotating in a horizontal plane, of an endless belt, band wheels on whichsaid belt is carried rotating on horizontal axes and so arranged that the lower portion of the belt extends across the face of the grinding disk above and parallel with said face adapted to receive between it and-said face of the grinding disk the articles to be ground,

disk the articles to be means forpressing downward the said lower 1 portion of the belt to hold the articles to be ground against the face of the grinding disk, means for rotating one of the band wheels, and means for moving articles to be ground into position to be carried by the belt onto the face of the grinding disk.

In testimony whereof I affix my signature this fourth day of March, 1920.

MALVER-N A. EATON. 

